Upstart Pitches Trading Sanctum

An upstart trading platform is pitching itself as an antidote to predatory high-frequency trading.

By

Scott Patterson

July 29, 2013 9:00 p.m. ET

WASHINGTON—Some big Wall Street firms are throwing their weight behind an upstart trading platform pitching itself as an antidote to a mounting problem in the stock market: predatory high-frequency trading.

The platform, IEX Group Inc., will go head-to-head in October with established stock exchanges and "dark pools," private trading venues that don't publish buy and sell prices for stocks. Its aim is to nullify certain...